Building form structure



Sept. 1, 1970 H. KE 3,526,383

BUILDING FORM STRUCTURE Filed Aug. 8, 1967 2 Sheets-Sheet 1 INVENTOR.

Dnwa h. Kins'raw I BY M M4MM 4 Irma/v56 Sept. 1 1970 D. H. KEYSTON3,526,383

BUILDING FORM STRUCTURE Filed Aug. 8 1967 x.- x W 'INVENTOR. F, G 6 041/0 1% flysroy United States Patent Ofice 3,526,383 BUILDING FORMSTRUCTURE David H. Keyston, Burlingame, Calif., assignor to Anza PacificCorporation, Burliugame, Calif., a corporation of California Filed Aug.8, 1967, Ser. No. 662,265 Int. Cl. E04g 11/00, 13/02 U.S. Cl. 249-19 12Claims ABSTRACT OF THE DISCLOSURE BACKGROUND OF THE INVENTION Field ofthe invention This invention relates generally to the field of buildingconstruction, and is specifically directed to an im proved constructionapparatus for filling-in the space between two laterally spaced buildingwall panels which have been positioned to define a portion of the wallof a building being erected. The gap between the opposing edge surfacesof the spaced building wall panels is filledin with a settableconstruction material, such as concrete, to provide a continuous sectionof building wall.

The invention is particularly directed to a building form structure indefining the limits of the space between the building wall panels intowhich the settable fill-in construction material is inserted. Such formstructure is comprised of cooperable elongated form member componentswhich are rigid and self-supporting so that they may be repeatedly usedin the construction of numerous building walls, or other related andanalogous wall structures.

The form structure disclosed herein has particular utility inconjunction with the erection of tilt-up wall buildings in whichconcrete or like wall panels are formed in horizontal position on theground and are thereafter tilted into operative position in the verticalorientation. Such procedure results in a space existing between the wallpanels which is filled-in by a settable construction material introducedtherebetween. The invention has utility, however, in constructing anybuilding in which it is desired or required to fill-in a gap betweenopposed edge surfaces of spaced wall or like panels.

Description of the prior art It has been generally known in theconstruction art heretofore to utilize building forms to place definitelimits on the space which exists between opposed edge surfaces ofbuilding wall panels erected by the tilt-up technique. Heretofore,multi-piece wooden form structures were employed for that purpose whichhad to be tailored to meet the requirements of a particular constructionproject. Such wooden form structures known heretofore were notrepeatedly reusable in the construction of numerous building wallsbecause the same were substantially damaged during separation from thewall panels engaged thereby during use. To adapt such wooden formstructures for reuse required substantial repair thereof which generallymade any attempted reuse uneconomical.

With prior known form structures, it was customary 3,526,383 PatentedSept. 1, 1970 to unite the wooden components thereof together at thesite of the construction job. After such components had served theirintended function, such components were largely destroyed during removalthereof from the resulting building wall. This common prior art practicewas extremely expensive because of the generally skilled labor requiredto fabricate such wooden form structure in place and because of thewasted materials resulting therefrom. Such prior known form structuresrequired many components, including numerous wooden parts and varioustypes of connectors required to retain the wooden parts securelytogether during use thereof.

With the improved self-supporting form structure of the presentinvention, a minimum number of components are required, both in definingthe form structure and in maintaining the components of the formstructure together during use thereof. Furthermore, the forms of thestructure of this invention may be positioned and repeatedly reused byworkmen of average skills. Also, preparation of the form structure forsuch reuse is minimal in that cleaning thereof is not difficult andrepair thereto is unnecessary. Thus, labor costs may be greatly reduced.Also, any increased initial cost of the form structure of this inventioncompared to the initial cost of wooden form structures is recoupedbecause of the elimination of the waste characteristic of priorconstructions.

This invention has the further advantage that removal of the formmembers of this invention from the building wall formed thereby issimplified because one or both of the subject form members is providedwith tapered side walls which permits such ease of removal. With priorwooden form structures, such tapered side walls were not provided and,as a result, damage to the wooden parts normally resulted during removalthereof from the wall formed thereby.

Also, prior wooden form structures produced undesirable roughened wallsurfaces in comparison to the smooth surfaces obtainable when using theform structure of this invention.

Further advantages over the prior art are provided by this invention,including greatly increased ease of handling and positioning of the formmembers in place, and

ease in transporting and storing the form members for reuse.

SUMMARY OF THE INVENTION The present invention relates to a sturdy,reusable building form structure defined by two elongated, preformed,rigid and self-supporting form members which are to be cooperablypositioned in engagement with opposite surfaces of two laterally spacedbuilding wall panels to bridge the space therebetween so that a settableconstruction material, such as concrete, may be introduced to fill-upsuch space. An improved method of building construction utilizing suchform structure also is involved.

The building forms of this invention are repeatedly reusable withoutrequiring repair thereof. The opposing form members are easily cleanedfollowing their separation from a building wall. Due to theself-supporting and reusable nature of the forms of this invention,there is a large reduction in labor costs in their use because extensivefabrication on the job, and waste, characteristic of prior known woodenform structures, are obviated.

The form structure of this invention comprises only two major formcomponents, and associated means for maintaining the same in positionduring use. At least one such form is channel-shaped with tapered sidewalls so that separation thereof from the building column defined by thesettable construction material introduced therein is facilitated. Theforms hereof are appropriately reinforced for strength required topermit their repeated reuse.

From the foregoing, it should be understood that ob jects of thisinvention include: the provision of an improved building form structurewhich is employed to bridge the gap between opposed edge surfaces of apair of laterally spaced building wall panels; the provision of such aform structure which is repeatedly reusable without requiring repair;the provision of a building form structure defined by a minimum ofcomponents; the provision of a building form structure which may bepositioned in place across the space between building wall panels byworkmen of average skills with minimum labor costs; the provision of abuilding form structure which may be easily removed from a building wallfollowing use thereof without destruction or damage thereto; and theprovision of a building form structure, the components of which may becompatibly used for erecting buildings of varying wall heights and whichare nestable for ease of storage and transportation; the provision of abuilding form structure which produces superior finishes in theresulting wall; and the provision of an improved construction method.These and other objects of this invention will become apparent from astudy of the following detailed disclosure in which reference isdirected to the appended drawings.

DESCRIPTION OF THE DRAWINGS FIG. 1 is an isometric view of the spacedbuilding wall panels positioned to receive a body of settableconstruction material in the gap between opposed edge surfaces thereof.

FIG. 2 is an isometric view corresponding generally to FIG. 1 showingthe space between the building wall panels filled in by a column ofsettable material introduced therebetween.

FIG. 3 is an elevational View showing one side of the form structure ofthis invention bridging the gap between a spaced pair of building wallpanels.

FIG. 4 is an elevational view of the opposite side of the form structureof this invention.

FIG. 5 is a horizontal sectional view through the building wall panels,the building form structure, and the building wall column confinedtherebetween, taken in the plane of line 5-5 of FIG. 3.

FIG. 6 is a side elevational view, partly in section, of the formstructure and wall structure taken in the plane of line 66 of FIG. 5.

FIG. 7 is a vertical sectional view through the form structure and wallstructure taken in the plane of line 7-7 of FIG. 5.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring first to FIGS. 1 and2, the manner of utilization of the form structure of this inventionwill be described. In this regard, while this invention has particularutility when used in conjunction with the tilt-up wall constructionprocedure in which wall panels of concrete or other suitableconstruction material are formed on the ground in horizontal orientationand are thereafter tilted upright to the vertical orientation, it shouldbe understood that this invention is usable in conjunction with anyconstruction method in which a space between two building wall or likepanels is to be filled-in by a suitable settable construction materialto provide a continuous wall structure. For purposes of illustration,hereinafter reference is specifically directed to utilization of thisinvention in conjunction with the tilt-up wall construction technique.

As seen in FIG. 1, two pre-formed building wall panels, designated 1 and2, are secured to extend upwardly from a supporting base 3 in knownfashion. Base 3 and the wall panels 1 and 2 may be formed of anysuitable construction material, of which concrete is illustrative. Thewall panels are laterally spaced from each other during verticalpositioning thereof, and the opposed edge surfaces 4 and 6 of therespective panels together define a vertically extending gap or space 7therebetween. It is into such space that a settable constructionmaterial, such as concrete, is to be introduced to close-off the gapbetween the wall panels to form a continuous wall structure which iscapable of supporting the roof loads to be applied thereto. While thesettable material is being introduced into the space 7 and hardeningtherein, the wall panels are maintained in proper vertical orientationby suitable means, such as by braces 9 interposed between oppositesurfaces of the wall panels and adjacent hori zontal surfaces, asillustratively shown in FIG. I.

In most construction situations, it is preferred to fill-in the space 7between wall panels 1 and 2 to a thickness which is greater than thethickness of the asociated wall panels so that an enlarged buildingcolumn is provided in the area between the oposed edge surfaces 4 and -6of the wall panels. Such a building column, designated 11, is shownbridging the gap between the wall panels 1 and 2 in FIG. 2. As will bedescribed hereinafter, such column 11 preferably is reinforced and iskeyed to the wall panels to provide a strong integral wall structure.

To permit formation of building column 11 between the wall panel opposededge surfaces, means must be provided to define the limits of the spacebetween the wall panels into which the settable construction material isintroduced and to retain the contour of such settable ma terial whilethe same is hardening. Such means in this invention is defined by abuilding form structure comprised of only two principal reusablecomponents. The use of only two components is in distinction to thecomplex and expensive multi-piece wooden form structures employed for asimilar purpose heretofore.

The principal components of the building'form structure of thisinvention are defined by two elongated, preformed, rigid andself-supporting form members, designated 12 and 13 respectively. Theforms 12 and 13, when positioned to receive settable constructionmaterial therebetween, are engaged with opposite surfaces of the pair ofbuilding wall panels 1 and 2 to define the limits on the space 7therebetween. As seen in FIG. 5, form 13 engages surfaces 14 of thebuilding wall panels, while form 12 engages the opposite surfaces 16 ofsuch panels.

In the preferred embodiment illustrated, the form structure is designedso that building wall column 11 may be formed between wall panels 1 and2 With one surface thereof substantially co-planar with the surfaces 14of such panels. Thus, form member 13 engaged with wall panel surfaces 14is provided with a generally flat base wall, as will be described.However, the other form member 12 is designed to permit building wallcolumn 11 to project beyond the surfaces 16 on the opposite side of thebuilding wall panels, as will be described. In this connection, however,it should be understood that the concept of this invention may beutilized in forming a building wall structure in which the columnprovided in the space between the wall panels is generally co-planarwith both opposed surfaces of the associated wall panel surfaces, or inwhich the column projects beyond both such opposed surfaces.

The preferred embodiment of the building form structure shown, however,includes only one form member which permits the building column 11 toproject beyond its associated wall panel surfaces. To this end, formmember 12, in horizontal cross-section, is generally channel shaped andis defined by two vertically extending, laterally spaced side walls 17and 18 which are tapered relative to each other. That is, as best seenin FIG. 5, side walls 17 and 18 converge relative to each other in adirection away from surfaces 16 of the building wall panels with whichform 12 is engaged. Side walls 17 and 18 are integrally connected witheach other by a vertically extending base wall 19 which extendstherebetween and is connected therewith by rounded corner portions 21.When form 12 is in position, base wall 19 preferably extends parallel tosurfaces 16 of the wall panels.

The tapered side walls 17 and 18 of form 12 are very important in thatthey greatly facilitate removal of the form from the column 11 followingsetting of the material from which the column is produced; This is indistinction to prior multi-piece wooden form structure in which suchtapered side walls were not employed, and as a result of whichseparation of the wooden form components from the column could beeffected in most cases only by destruction of the form components,thereby precluding their reuse.

Form 12 further includes a pair of vertically extending,

laterally spaced flanges 22 and 23 which extend in opposite directionsfrom the respective side walls 17 and 18 of which they form directcontinuations. Such flanges 22 and 23 lie generally in the same planeand are adapted for direct engagement with the surfaces 16 of thebuilding wall panels, as best seen in FIG. 5. It will be noted from FIG.3 that the side Walls, base wall, and flanges are verticallyco-extensive. In this regard, for most uses, the forms 12 and 13 shownherein are manufactured in a length suflicient to provide a buildingwall column 11 therebetween which meets a wide variety of building wallrequirements. However, if desired, other similar form members may beplaced end to end with the forms shown when it is necessary to provide abuilding wall column of a length in excess of that capable of formationby a single pair of forms.

Flanges 22 and 23 terminate in reversely bent generally parallel edges,designated 24 and 26 respectively, which project in a direction awayfrom surfaces 16 of the associated building wall panels. Such edges areprovided to impart additional rigidity to the form 12.

It should be understood that the construction material introducedbetween forms 12 and 13 to define the column 11 therebetween exertssubstantial forces on the forms which tend to separate the forms and todistort the side walls 17 and 18 of form 12 laterally outwardly awayfrom each other. It has been found, therefore, that means should beprovided to counteract such forces and to overcome their detrimentaleffect so that a uniform building column having smooth surfaces may beproduced. Such means in the embodiment illustrated includes bracesinterposed between the edges 24 and 26 and the side walls 17 and 18 ofform 12 associated therewith.

In the preferred embodiment, such braces are not coextensive with theirassociated edges 24 and 26 and flanges 22 and 23. To effect savings inweight and material, such braces are provided at predetermined spacedlocations along the vertical extent of the form 12, and are defined bygenerally L-shaped brace members 27. As best seen in FIG. 5, one leg ofeach L-shaped brace is secured to an associated edge 24, 26 as asubstantial planar continuation thereof, while the other leg thereofextends generally at right angles to the first leg and is secured to anassociated side wall 17, 18. The braces may be secured to their associated side walls and flange edges in any suitable fashion, such as bywelding.

As also seen in FIG. 5, the legs of the respective braces which areconnected with the flange edges along opposite sides of form 12 extendgenerally parallel to each other and define seats for other means toassist in precluding distortion of form 12 during use thereof. In theillustrated embodiment, such other means for precluding distortioncomprises a series of bolt and nut assemblies, collectively designated28, each of which is defined by a tapered bolt 29 having a nut 31 on onethreaded end thereof and an enlarged head or another nut 32 on the otherend thereof, as best seen in FIG. 5. The bolt and nut assemblies 28shown in the drawings are standard commercial items obtainable on theopen market. Bolts 29 are tapered from one end toward the other thereofto facilitate their lengthwise removal from the column 11 after the samehas hardened.

It should be noted from FIG. 3 that braces 27 and the bolt and nutassemblies 28 extending laterally therebetween have their verticalspacing altered from one end of form 12 toward the other. That is,adjacent the lower end thereof where the pressure exerted on form 12 isthe greatest, such braces are spaced closer together than they are atthe upper end thereof where the pressure is less. Thus, more resistanceto distortion is provided adjacent the base or lower end of form 12.

It should also be understood that each of braces 27 and side walls 17and 18 in the areas thereof in line with such braces are provided withaligned apertures therethrough through which the respective bolts 29 ofthe bolt and nut assemblies 28 may be extended. Such bolt and nutassemblies preferably are positioned laterally through the form 12 priorto introduction of the settable construction material into the spacedefined thereby with the building wall panels.

The other form 13, as seen in FIGS. 4 and 5, is of shallow channel shapein horizontal cross section and is defined by a vertically extendingflat base wall 33 along opposite lateral margins of which are provided apair of vertically extending, laterally spaced flanges 34 and 36 whichproject outwardly from the base wall in generally parallel relationshipaway from surfaces 14 of the associated building wall panels 1 and 2.Such flanges impart desirable rigidity to the form 13. As notedpreviously, the flat base wall of form 13 is intended to be engageddirectly with surfaces 14 of the wall panels so that the building column11 will provide a surface which lies in substantially co-planarrelationship with such wall panel surfaces when the forms 12 and 13 areremoved following setting of the material which defines the column 11.

Means are provided to maintain the forms 12 and 13 in secure operativeengagement with the opposite surfaces 14 and 16 of the wall panels, asseen in FIGS. 5 through 7. Such means in the embodiment illustratedcomprises a series of vertically spaced bolt and nut assemblies,collectively designated 37, each of which extends through the space 7limited by the forms 12 and 13 and the opposed edge surfaces 4 and 6 ofthe wall panels. Bolt and nut assemblies 37 correspond in constructionto the assemblies 28 described previously and each includes a taperedbolt 38 having a removable nut 39 on one threaded end thereof and anenlarged head or nut 41 on the other end thereof. Bolts 38 arelongitudinally tapered to facilitate their lengthwise removal from thecolumn 11 following setting of the material thereof.

Thus, it should be appreciated that the form structure of this inventionis made up of a minimum of components, consisting of only two forms anda comparatively small number of bolt and nut assemblies. As a result,positioning of the form structure may be easily and rapidly effected.

To provide seats for the bolt and nut assemblies 37, and to reinforceand rigidify the respective forms 12 and 13 in the transverse directionacross the respective base walls thereof, a series of vertically spaced,apertured reinforcing ribs are formed integral with the base walls, asseen in FIGS. 3 and 4. The ribs on form 12 are designated 42 and theribs on fofm 13 are designated 43. By comparing FIGS. 3 and 4, it willbe noted that the respective ribs 42 and 43 are provided on therespective forms in vertical alignment with each other so that the boltand nut assemblies 37 may be extended between the forms in generallyhorizontal orientation as seen in FIG. 7.

In the preferred embodiment shown herein, each of the ribs 42 and 43 onthe respective forms 12 and 13 is defined by a generally U-shapedchannel, as best seen in FIG. 7, which is integrally secured to therespective forms in any suitable fashion, such as by welding. The ribson the respective forms thus provide flat seats for engagement by thenut and bolt assemblies so that the flanges 22 and 23 of form 12 and thebase wall 33 of form 13 may be 7 held in secure engagement with theopposite surfaces 14 and 16 of the building wall panels.

As also noted from FIGS. 3 and 4, the spacing between the ribs 42 and 43on the respective forms varies from the lower ends of the forms towardtheir upper ends. That is, more ribs are provided adjacent the lowerends of the forms. This variance in vertical spacing is effected toadapt the forms to counteract more effectively the greater forcesapplied thereto adjacent their lower ends by the weight of the settableconstruction material. Thus, more bolt and nut assemblies are requiredadjacent the base of the column.

In this regard, it will also be noted that preferably two or morereinforcing ribs 42 (and associated bolt and nut assemblies) areprovided between each pair of braces 27 on form 12. This preference iseffected to adapt the forms 12 and 13 to be more resistant to spreadingapart when the material of column 11 is inserted therein. The frictionalcontact of flanges 22 and 23 of form 12 with the surfaces 16 of thebuilding wall panels assists in resisting any tendency of the walls 17and 18 to spread apart during use. Therefore, less lateral reinforcementis required between the side walls of form 12 than between therespective forms 12 and 13.

When forms 12 and 13 are positioned as seen in FIG. 5, settableconstruction material may be introduced into the space therebetween inany known manner, such as by a conventional nozzle and hose apparatus,to provide the building wall column 11. Forms 12 and 13 are maintainedin place until the column has completely hardened, following which therespective nut and bolt assemblies 28 and 37 are removed, and the formsare separated from the column for cleaning and subsequent reuse asdesired. The tapered side walls 17 and 18 of form 12 greatly facilitateits separation from column 11 Without risking damage to the form or tothe column.

It should be further noted, by referring to FIG. 1 and FIG. 5, that thecolumn 11 preferably is tied in with, or keyed to, the wall panels 1 and2 between which it is interposed. Such keying together is effected by asuitable reinforcing structure, generally designated 46 in FIG. 1, whichcooperates with reinforcing means formed in the wall panels. As seen inFIGS. 1 and 5, reinforcing structure 46 includes a series of verticalreinforcing rods 47 positioned in a generally rectangular pattern whichare coupled with a series of spaced horizontal reinforcing rods 48 eachof which is formed with a generally rectangular configurationcorresponding to the general configuration of the column 11 to be formedtherearound. Additionally, a series of vertically spaced horizontallyextending reinforcing rods 49 (FIG. are generally positioned in the wallpanels with their ends 50 projecting from the edge surfaces of thebuilding wall panels 1 and 2 into the space within the confines of thereinforcing structure 46. Thus, when column 11 is poured in placebetween forms 12 and 13, the reinforcing structure 46 and rods 49 couplethe column and the wall panels together into a unitary assembly.

To further assist in keying together column 11 with the wall panels, theopposed edge surfaces 4 and 6 of the wall panels 1 and 2 preferably areprovided with stepped con tours (see FIGS. 1 and 5) with which thecolumn 11 interlocks when poured in place.

To enhance the appearance of the wall structure when form 13 is removedfrom engagement therewith, a pair of generally triangular wooden or likestrips 51 are formed with the wall panels 1 and 2 and are positioned inalignment with the intended line of juncture between the edge surfacesof the wall panels 1 and 2 and the column to be poured in placetherebetween. Such strips are removed from the wall when form 13 isremoved, thus leaving generally triangular indentations or groovesrunning the full extent of the wall which is visible from the side ofthe wall defined by surfaces 14. Such grooves produce an appearance ofregularity between the wall panels and the column which might nototherwise exist if the wall panels and the column were joined withoututilizing such strips.

To insure the necessary rigidity which permits repeated reuse of theforms 12 and 13 of the subject building form structure, it has beenfound that the same should be formed from a sturdy material such assteel. However, it is contemplated that other materials of lesser weightthan steel, such as aluminum alloys or rigid plastics, which possess therequisite strength, may be employed if preferred. steel plate has beenfound particularly effective.

To permit forms 12 and 13 to be positioned in place to bridge the gapbetween the wall panels, irrespective of the material from which suchpanels are constructed, a lifting attachment, designated 52, is providedadjacent the upper edge of each of the forms as seen in FIGS. 3 and 4.Such attachment may be defined by a short length of angle bracket havinga hole therein adapted to receive a hook member connectable with alifting cable of a crane so that the forms may be mechanicallypositioned in engagement with the opposite surfaces of the wall panels.

Forms 18' in length have been found suitable for most constructionprojects. Where longer columns are required, two or more forms may beconnected together in end to end relationship.

The form members described provide a building column 11 having smoothexterior surfaces superior in finish to those producible heretofore withwooden building forms. Also, the forms of this invention are simple toclean following use thereof and accordingly may be prepared for reusewith minimum labor costs. Furthermore, because of the tapered side wallsof the form 12, a quantity of such forms may be stored or transported innested fashion, thereby reducing space requirements duringtransportation or storage.

The foregoing disclosure of a preferred embodiment of this invention isintended to be illustrative rather than limiting. The scope of theinvention should be interpreted in light of the claims appended hereto,and modifications to the preferred embodiment which incorporate thereinthe spirit of this invention are intended to be encompassed within suchscope.

I claim:

1. A reusable building form structure for use in constructing tilt-upwall buildings and the like, comprising (A) a first pre-formed, rigidand self-supporting elongated form to be positioned in engagement withone surface of each of a pair of laterally spaced building wall panelsto bridge the space therebetween, and

(B) a second pre-formed, rigid and self-supporting elongated form to bepositioned in engagement with an opposite surface of each of said pairof building wall panels to bridge said space therebetween,

(C) at least one of said forms being channel shaped in transverse crosssection,

(D) said one form being defined by 1) a pair of opposed tapered sideWalls which converge toward each other,

(2) a base wall which extends between and integrally connects saidconverging side walls, and

(3) a flange extending laterally outwardly from each of said side walls,

(4) said flanges lying generally in the same plane and being adapted toengage the surfaces of said pair of building wall panels when said oneform is in position,

(B) said space between said pair of building wall panels being adaptedfor filling by a settable construction material to be introduced intosaid space when said forms are engaged with the opposite surfaces ofsaid wall panels.

2. The building form structure of claim 1 in which said one form furtherincludes (5) braces interposed between the lateral margin of each ofsaid flanges and the tapered side wall associated therewith from whichsuch flange extends,

(6) said braces providing reinforcement for said tapered side walls andforming seats for means engageable with said one form to precludedistortion of said side walls thereof when such form is in use.

3. The building form structure of claim 2 in which each of said bracescomprises (a) a generally L-shaped member, one leg of which isintegrally connected with the lateral margin of its associated flange,and the other leg of which is integrally connected with an associatedside wall,

(b) the brace interposed between the lateral maigin of one of saidflanges and its associated side wall being aligned with the bracesimilarly interposed between the other of said flanges and itsassociated side wall,

(c) the first mentioned legs of the respective braces extendinggenerally parallel to each other,

(d) said means engageable with said one form comprising a bolt and nutassembly to be positioned through said one form when the same is in use,

(e) said firstmentioned legs providing seats for said bolt and nutassembly.

4. The building form structure of claim 2 in which (7) said braces arenot coextensive with their associated flanges,

(8) each of said flanges having a series of said braces spacedlypositioned along the length thereof,

(9) the series of braces positioned along one of said flanges beingaligned with the series of braces positioned along the other of saidflanges.

5. The building form structure of claim 1 in which said one form furtherincludes a series of rigid apertured rib members spacedly positionedalong and secured to the base wall of said one form and extendingtransversely thereof,

(6) said rib members providing reinforcement for said base wall andproviding seats for bolt and nut assemblies to be extended through saidspace between said building wall panels at spaced locations therealongto maintain said forms in engagement with said wall panels so that saidspace may be filled with said construction material.

6. The building form structure of claim 5 in which (7) the spacingbetween rib members increases from one end of said base wall toward theother end thereof.

7. The building form structure of claim 5 in which the other of saidforms includes 1) a series of rigid apertured rib members spacedlypositioned therealong and extending transversely thereof to reinforcethe same and provide seats for said bolt and nut assemblies to beengaged therewith,

(2) the rib members of said other form being aligned with correspondingrib members of said oiie 'form to permit passage of such bolt and nutassemblies through both said forms to rigidly connect the same togetherwhen in use.

8. A reusable building form structure for use in constructing tilt-upwall buildings and the like, cofnpi'ising (A) a first pre-formed, rigidand self-supporting elongated form to be positioned in engagement withone surface of each of a pair of spaced building wall panels to bridgethe space therebetween, and

(B) a second pre-formed, rigid and self-supporting elongated form to bepositioned in engagement with an opposite surface of each of said pairof building wall panels to bridge said space therebetween,

(C) at least one of said forms being channel shaped in transverse crosssection,

(D) said one form being defined by 1) a pair of opposed side walls,

(2) an intermediate portion extending between and connecting said sidewalls, and

(3) a flange extending laterally outwardly from each of said side walls,

(4) said flanges being adapted to engage surfaces of said pair ofbuilding wall panels when said one form is in position,

(E) said space between said pair of building wall panels being adaptedfor filling by a settable construction material to be introduced intosaid space when said forms are engaged with said opposite surfaces ofsaid building wall panels.

9. The building form structure of claim 8 which includes (F) connectingmeans usable in conjunction with said forms to be positioned through thesaid space between said building wall panels at spaced locationstherealong when said forms are engaged with said oposite surfaces ofsaid building Wall panels to maintain said forms in engagement with saidopposite surfaces so that said space may be filled with saidconstruction material.

10. The building form structure of claim 8 in which the other of saidforms is of shallow'channel shape in cross section defined by agenerally flat base wall and flanges projecting outwardly from said basewall.

11. The building form structure of claim 8 in which each of said formsincludes (F) a series of rigid apertured rib members spacedly positionedalong and secured thereto and extending generally transversely thereof,

(1) said rib members providing reinforcement for said forms and formingseats for bolt and nut assemblies to be extended through said spacebetween said building wall panels at spaced locations therealong tomaintain said forms in engagement with said wall panels so that saidspace may be filled with said construction material.

12. The building form structure of claim 11 in which (2) the spacingbetween adjacent rib members increases from one end of each of saidforms toward the other end thereof.

References Cited UNITED STATES PATENTS 2,979,800 4/1961 Wilbur et al249-49 3,300,943 1/1967 Owens 264-35 X J. HOWARD FLINT, JR., PrimaryExaminer US. Cl. X.R.

